printf: %X (uppercase X)

Type Specifiers

/*
Specifier Description
d Display argument as a decimal number
b Display an integer as a binary number
c Display an integer as ASCII equivalent
f Display an integer as a floating-point number (double)
o Display an integer as an octal number (base 8)
s Display argument as a string
x Display an integer as a lowercase hexadecimal number (base 16)
X Display an integer as an uppercase hexadecimal number (base 16)
*/